Pond Bottom Condition - 02 – The Monitoring Methods

The dirt in pond bottom usually in form of black mud which settle in bottom and also contain H2S and NH3 which have acid character and at selected dose can endanger for shrimps. This dirt come from a metabolism process which conducted by the water organisms, plankton mortality and shrimp feed residue which not consumed and also influence from other shrimp culture treatment. Existence of black mud in pond bottom can monitoring through method like explained bellow, there are:

1. Monitoring to shrimp’s shell/chitin through periodic sampling and ancho monitoring. Pond bottom condition that dirt and full of mud usually affect at shell/chitin appearing that tending to the darker than at normal situation. At the time of conducted sampling, pond bottom dirt/mud usually follow brought at the is fish-net which dispersed into the pond.
   
   
2. Direct checking to pond bottom by doing the diving to see the bottom condition [of] fishpond and shrimp condition.
   
   
3. Direct checking to pond water outlet at the time of conducted water circulation by reckoning the required duration to throw away the dirt/mud. At this activity is also needed to pay attention fluency level of the water outlet channel in throw away the pond water, if happened the gagging hence required an advanced identify to cause of the gagging. Other factor which also needed to consider is the existence of shrimps carcass which following brought out together with pond water pursuant to amount and condition of the shrimp carcass so that can be taken a decision which instruct at harvesting decision and or treatment decision.
   
   
4. Monitoring to pond water surface at the time of water wheel is not operated. Pond bottom condition which dirty and full of mud usually throw away the air bubbles emerging from pond bottom up at water surface, if on the surface of pond water met too many this phenomenon hence pond bottom condition is very dirty and full of mud.

Monitoring of pond bottom condition needed to do careful either thoroughly periodic and incidentally monitoring so that problems that happened can handled immediately. A serious problem that usual happened is shrimps mortality in pond bottom that caused by various problems that not detected. Shrimp mortality that caused by moulting process usually met and has a natural character caused by cannibalism of other shrimps in amount still reside at the tolerance range specified. Is while mass plankton mortality in pond bottom and caused by the problems which not detected usually prawn carcass concentration in water outlet central and at more serious level, prawn carcass disseminate in pond bottom.

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